Nope, thats not the problem, I've tryed even with the normal map:
float3 normal = 2.0f * tex2D(Sampler1, IN.texture0).rgb - 1.0f;
But the problem remains the same, as it rotates the object gets brighter and then returns to normal, it must be somewhere else, it seems like a problem of vector normalization, but I'm 100% sure that everything is normalized. Maybe I'm building the matrices in the wrong way?
Need help with HLSL bump mapping
Try changing in your vertex shader, this:
Also, are you setting your mesh correctly in your code? It needs to have Bi/Tang etc.
//change thisOUT.light = normalize(mul(WTTS, lightDirection));//to thisOUT.light = mul(WTTS, lightDirection);//then in your fragment.normalize(IN.light);//you might need to do -IN.light for a directional, I'm not sure on that though.Also, are you setting your mesh correctly in your code? It needs to have Bi/Tang etc.
If you are not setting your mesh correctly with tangents then your lighting will look wrong. Try looking into D3DXComputeTangentFrameEx .
Also, you are going to want to change your normal equation to tex2D(normalMap, texcoord) * 2.0f - 1.0f. You want to do this because of the range of points. A normal goes from -1 to 1 and a texture coordinate only goes from 0 to 1. Multiplying by 2, then subtracting one (the difference) will give you the correct normal. If you do not do this it could also cause your lighting to be wrong.
Also, you are going to want to change your normal equation to tex2D(normalMap, texcoord) * 2.0f - 1.0f. You want to do this because of the range of points. A normal goes from -1 to 1 and a texture coordinate only goes from 0 to 1. Multiplying by 2, then subtracting one (the difference) will give you the correct normal. If you do not do this it could also cause your lighting to be wrong.
Author
Yep I started to think it was a problem with my mesh, now I'm at uni, as soon as I get home I'll control if my mesh has tangents correctlz computed.
If you need to see an example of computing binormals and tangents for a mesh at load time, check out the Parallax Occlusion Mapping sample in the SDK.
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